I have a Mitsubishi gallant cylinder number 1 not firing but spark plug is firing engine misfire,engine check comes on for it to start and it has a hard start help.

Double check the spark plug wire firing order. The cylinder have to have voltage in a certain order. If you do not have a motor manual you can google for this information. just write for example: 2002 ford taurus 6 cylinder spark plug firing order. The firing order goes in sequence usually in a clockwise direction. For example: 1, 5, 3 ,6 2, 4 in a clockwise order. spark plug #1 wire goes to the coil then spark plug #5 wire goes on the coil in a clockwise rotation, next to where spark plug # 1 was connected. This would mean that spark plug number 1 will fire (or get voltage), then spark plug nuimber 5 will fire (get voltage), then spark plug number 3 and so on. The sequence will continue to happen over and over again as long as the car is on. Here's another tip! When it nice and dark outside, turn your car on with the hood open and look at your spark plug wires for any voltage jumping from the wires to the motor metal. Keep in mind you may have to tent yourself with a cardboard to see the voltage arcing to metal. It has too be super dark for you too see this fault. Any arcing will cause your engine to misfire and your engine light to come on. Hope this gives you a starting point to finding the problem. Good Luck.

It could be your Cadillac converter. I had the same problem with a 2006 eclipse, driving it it would stop off it i didn't have my foot on the gas, i replaced the converter and the mass air flow sensor and it fired right up and drove fine.

I'm assuming this is a DIS(distibutorless ignition system).If it is,the most common cause is a defective coil pack.Each coil will fire a pair of cylinders together on 4 and 6 cylinder engines(one "waste" spark,one to ignite the mixture).Try swapping the wires at the coil pack to see if the misfire follows the coil tower,or the same cylinder misfires(keep in mind that a check engine light means you will have to clear the code to get the computer to feed that cylinder fuel before you start it up again).If the other cyl on the pack now misfires(i believe 1+5 are on the same pack on a Ford engine),then the coil is bad(spark is "leaking"to ground).If the same cyl still misfires,try swapping a wire+plug from another cylinder.

Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


P0301 Code - Cylinder #1 Misfire
P0302 Code - Cylinder #2 Misfire

A P0301 or P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1 or #2

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0301 or P0302 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope ths helps. Keep us updated and remember to rate this answer.

check the cylinder number 1, it should be the one that is on side where the timing belt is. I would say check the spark plug cuz it might be bad and not sparking and causes a misfire. If you got any other questions please feel free. Good luck

ok....when you talk about firing, do you mean that only the number 1 cylinder is receiving a spark from the distributor, as with this model, the "timing of the spark and operation of the spark is purely in the distributor, so unless you are 100 % sure that the distributor you replaced is good....i would be loooking at possible engine ecu......(there is no crankshaft position sensors or cam sensors in this model)

However, if you have only found that "firing" means the cylinder 1 is the only one attempting to fire, such as good spark, at the right time, with fuel and good compression, i would be doing a compression check, and double check the timing of the distributor.......

The error code p0301 ,This code is related to misfire.The cylinder is misfiring. p0301 this is the indication of cylinder number 1 ,that is misfiring.If the code comes up as p0300 this is the indication of random misfire from all the cylinders.But in your case its indicating p0301 this is indication of cylinder 1 misfire.Check cylinder 1 and replace the faulty cylinder 1 to clear the fault.The spark plugs and the wires connecting to spark plugs also needs to be checked. Keep updated with any more query.Thanks.

1.Plugs
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,
Lee